I have two open loop galvanometers (
http://www.laserfx.com/Backstage.LaserFX.com/Systems/Pinouts/MFEdataLG.jpg
) which i would like to use emc controlled laser show
(similar to this one:
http://elm-chan.org/works/vlp/report_e.html ).
I will use a hardware encoder for measuring the angle
of galvanometer. I will configure hal using
hal-encoder and hal-pid. I think i will manage to do
this (i checked the etch-servo sample configuration).
The galvanometer is current driven, so i was thinking
of using a op-amp and R-2R resistor ladder for current
source. So i need a 10 bit digital output for R-2R
resistor ladder (instead of pwm used in etch-servo
sample configuration). How can i archive this? Is this
a good solution, or should i also use PWM (i didn't
make the hardware driver yet).
My second problem is, that I think the position signal
from emc should be modified a bit (
hight_on_the_wall=constant*tangens(emc_output signal
), because otherwise the "drawing" on the wall will be
stretched at the sides. How can i achieve this?
Regards
Klemen
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